== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 10:50:11 (1773240611)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       25208     1246096   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22036     1249268   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       33288     3573732   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       12316     3594704   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45604     7168436   1%  /mnt/lustre